All categories

3 years ago

Pls I need help pls

Mathematics

1 answer:

Dafna1 [17]3 years ago

3 0

Answer:

what is the problem? In which question do you need help?

You might be interested in

J/2--12=15 j/2 is a fraction

Natasha_Volkova [10]

Answer:

j = 54

Step-by-step explanation:

j/2 - 12 = 15

j/2 = 15 +12

j/2 *2 = 27 * 2

j = 54

If you're kind enough, please mark this as the brainlist answer!

3 0

3 years ago

Simplify −6(3i)(−2i)

Alekssandra [29.7K]

The answer is approximately -36

5 0

3 years ago

Read 2 more answers

A diamond ring increases in value at a rate of 5% per year. If the ring was purchased for $1200, which equation would calculate

Margarita [4]

Answer:

A - y = 1200(1+.05)^30

Step-by-step explanation:

In this case, you need to calculate the future value and the formula to calculate that is:

FV=PV*(1+r)^n

FV=future value

PV=present value

r=rate

n=number of periods of time

The present value would be the price of the ring which is $1200. The rate is 5% per year and the number of periods of time is 30 years since you need to find the ring's worth in 30 years. Now, you can replace the values on the formula:

FV=1200*(1+0.05)^30

According to this, the answer is that the equation to calculate how much will it be worth in 30 years is: y = 1200(1+.05)^30.

8 0

3 years ago

Assume that a simple random sample has been selected from a normally distributed population. Find the test statistic t.

lawyer [7]

Using the t-distribution, it is found that the p-value of the test is 0.007.

At the null hypothesis, it is tested if the mean lifetime is not greater than 220,000 miles, that is:

$H_0: \mu \leq 220000$

At the alternative hypothesis, it is tested if the mean lifetime is greater than 220,000 miles, that is:

$H_1: \mu > 220000$ .

We have the standard deviation for the sample, thus, the t-distribution is used. The test statistic is given by:

$t = \frac{\overline{x} - \mu}{\frac{s}{\sqrt{n}}}$

The parameters are:

$\overline{x}$ is the sample mean.
$\mu$ is the value tested at the null hypothesis.
s is the standard deviation of the sample.
n is the sample size.

For this problem:

$\overline{x} = 226450, \mu = 220000, s = 11500, n = 23$

Then, the value of the test statistic is:

$t = \frac{\overline{x} - \mu}{\frac{s}{\sqrt{n}}}$

$t = \frac{226450 - 220000}{\frac{11500}{\sqrt{23}}}$

$t = 2.69$

We have a right-tailed test(test if the mean is greater than a value), with t = 2.69 and 23 - 1 = 22 df.

Using a t-distribution calculator, the p-value of the test is of 0.007.

A similar problem is given at brainly.com/question/13873630

8 0

2 years ago

A plumber uses the expression 48 + 25h to determine the number of dollars to charge each customer. If h = 4, how much does the c

Firdavs [7]

Answer:

You just need to substitute 4 in for h.

So 48 + 25(4) = 48 + 100 = 148

4 0

3 years ago

Read 2 more answers

Pls I need help pls​

Pls I need help pls